<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>样式的继承体现</title>
    <link rel="stylesheet" href="../_css/div_style.css"/>
</head>
<body>
<!--给三个div设置 一个通用样式-->
<!--再给每个div设置私有样式-->
<div class="top">
    <div class="top_inner">

    </div>
</div>
<div class="main"></div>
<div class="foot"></div>
</body>
</html>